JP2017152908A - Sound field control system, analyzer, acoustic device, control method for sound field control system, control method for analyzer, control method for acoustic device, program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform accurate sound field control even if a time from a sound production command of a test sound to sound production is unknown.SOLUTION: A sound field control system SY comprises: a sound production section 210 which produces test sounds from multiple speakers; a sound collection section 130 for collecting the test sounds by a microphone; an analysis section 150 for comparing information indicating sound production timing of a test signal stream producing the test sounds successively from the speakers in predetermined timing with sound collection timing of the collected test sounds and calculating a time difference between the sound production timing of each of the test sound and the sound collection timing; and a signal processing section 230 which performs delay processing on sound signals to be supplied to the speakers based on the calculated time difference between the sound production timing of each of the test sounds and the sound collection timing.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sound field control system for performing sound field control of an acoustic device having a multi-channel speaker, an analysis device, an acoustic device, a control method for the sound field control system, a control method for the analysis device, a control method for the acoustic device, a program, The present invention relates to a recording medium.

  Conventionally, patent document 1 is known as this kind of technique. In Patent Document 1, an acoustic device (acoustic adjustment device) and an analysis device (acoustic analysis device) are connected, and the acoustic device responds to a test signal generated from each speaker and a means for generating a test signal. Means for inputting a collected sound signal obtained by collecting the test sound with a microphone and means for providing the test signal and the collected sound signal to the analysis device, and the analysis device provides the test signal and the collected sound signal to the provided test signal. A means for performing an acoustic analysis based on the information and generating adjustment information (information for performing a delay process of an audio signal in order to eliminate a sound delay caused by a variation in distance from each speaker to the microphone) to be provided to the sound device; And an automatic sound adjustment system including means for providing the generated adjustment information to an audio device. As described above, since the adjustment information is generated by the analysis apparatus, Patent Document 1 has an effect that sound field control (test signal measurement and audio signal delay processing) can be realized without applying a control load to the acoustic apparatus.

Japanese Patent Laid-Open No. 2004-159037

  However, in the configuration of Patent Document 1, it is necessary to attach a microphone to the acoustic device. Therefore, in order to perform sound field control with a simple configuration, it is conceivable to use a smartphone (a microphone mounted on a smartphone) instead of the attached microphone. Thereby, the troublesome handling of the wired cable of the microphone can be eliminated, and the cost of the acoustic device can be reduced. However, when a test sound generation command and sound collection are performed using a smartphone, a conventional sound field control algorithm using an attached microphone cannot be employed.

  In the conventional sound field control algorithm, the distance from the speaker to the microphone is measured on the assumption that the time from the sound generation command of the test sound by the sound device to the sound generation is known. That is, the elapsed time Ta from the sound generation command to sound collection is measured, and the time from sound generation by the speaker to sound collection by the microphone (Ta−Tb) is calculated by subtracting the time Tb from sound generation command to sound generation. And the distance from a speaker to a microphone is calculated | required by multiplying the time (Ta-Tb) from the calculated pronunciation to sound collection by the speed of sound.

  On the other hand, when a sound generation command is issued from a smartphone, a sounding device is different from a device that issues a sounding command. In addition, when a sound generation command is issued by wireless communication from a smartphone, a time lag from the sound generation command to the sound generation is not correctly measured because a communication deviation occurs in the time from the sound generation command to the sound generation. For this reason, there has been a problem that accurate sound field control cannot be performed when a smartphone is used (when the time from the test sound generation command to sound generation is unknown).

  In view of the above problems, the present invention provides a sound field control system, an analysis device, a sound device, a sound device capable of performing accurate sound field control even when the time from the sound generation command to sound generation is unknown. It is an object to provide a method for controlling a field control system, a method for controlling an analysis device, a method for controlling an acoustic device, a program, and a recording medium.

  The sound field control system of the present invention includes a sound generation unit that generates a test sound on a plurality of speakers, a sound collection unit that collects a test sound by a microphone, and a test sound from each speaker sequentially at a predetermined timing. An analysis unit that compares the information indicating the sound generation timing of the test signal sequence to be generated with the sound collection timing of each collected test sound, and calculates the time difference between the sound generation timing and the sound collection timing of each test sound, and the calculation And a signal processing unit that performs a delay process of the audio signal supplied to each speaker based on the time difference between the sound generation timing and the sound collection timing of each test sound.

  The analysis apparatus according to the present invention has a sound generation command unit that issues a sound generation command, which is a command for causing a plurality of speakers to generate a test sound, a sound collection unit that collects a test sound by a microphone, and a test sound. Comparing the information indicating the sound generation timing of the test signal sequence to be generated from each speaker sequentially with the timing and the sound collection timing of each collected test sound, and calculating the time difference between the sound generation timing and the sound collection timing of each test sound Based on the time difference between the sound generation timing and sound collection timing of each test sound calculated, and the adjustment information used for delay processing of the audio signal supplied to each speaker or a command to match the distance from each speaker to the microphone And an information generation unit that generates sound field control information.

  The acoustic device according to the present invention receives sound collection information indicating the sound collection timing of each test sound collected by the microphone from a sound generation unit that causes a plurality of speakers to generate a test sound and an external device including the microphone. Compare the sound information receiving unit and the information indicating the sound generation timing of the test signal sequence that causes the test sound to be generated from each speaker sequentially at a predetermined timing with the sound collection timing of each test sound obtained from the sound collection information. The analysis unit that calculates the time difference between the sound generation timing and the sound collection timing of each test sound, and the delay processing of the audio signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound And a signal processing unit for performing the processing.

  The control method of the sound field control system of the present invention includes a sound generation step for causing a plurality of speakers to generate a test sound, a sound collection step for collecting the test sound with a microphone, and a test sound in sequence at a predetermined timing. An analysis step for calculating the time difference between the sound generation timing and the sound collection timing of each test sound by comparing the information indicating the sound generation timing of the test signal sequence generated from each speaker with the sound collection timing of each collected test sound And a signal processing step of performing a delay process of the audio signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound.

  The control method of the analysis apparatus of the present invention includes a sound generation command step for performing a sound generation command that is a command for causing a plurality of speakers to generate a test sound, a sound collection step for collecting the test sound with a microphone, and a test sound in advance. Compare the information indicating the sound generation timing of the test signal sequence to be sounded from each speaker in sequence at the specified timing with the sound collection timing of each collected test sound, and determine the sound generation timing and sound collection timing of each test sound. Based on the analysis step for calculating the time difference and the calculated time difference between the sound generation timing and sound collection timing of each test sound, the adjustment information used for delay processing of the audio signal supplied to each speaker or the distance from each speaker to the microphone And an information generation step for generating sound field control information that is a command to be matched. .

  The method for controlling an acoustic device according to the present invention includes a sound generation step for causing a plurality of speakers to generate a test sound, and sound collection information indicating a sound collection timing of each test sound collected by the microphone from an external device including the microphone. A received sound collection information receiving step, information indicating the sound generation timing of the test signal sequence to be generated from each speaker sequentially at a predetermined timing, and the sound collection timing of each test sound obtained from the sound collection information, And the analysis step for calculating the time difference between the sound generation timing and the sound collection timing of each test sound, and the sound signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound. And a signal processing step for performing a delay process.

According to the configuration of the present invention, the information indicating the sound generation timing of the test signal sequence is compared with the sound collection timing of each test sound, and the time difference between the sound generation timing and the sound collection timing of each test sound is calculated. Since the audio signal supplied to each speaker is delayed based on the time difference, accurate sound field control can be performed even when the time from the test sound generation command to the sound generation is unknown. That is, since it is not necessary to measure the elapsed time from the sound generation command of each test sound to the sound collection, sound field control using a general smartphone can be realized.
“Timing” refers to time setting, not period setting. For example, “information indicating the sound generation timing of the test signal sequence” refers to information indicating the sound generation time of each test sound defined by the test signal sequence. The “sound generation timing” may be defined by a sound generation interval between test sounds, or may be defined by a time signature, a rhythm, a time length thereof, and the like. The “sound collection timing of each test sound” refers to the sound collection time of each test sound. The “sound collection timing” may be defined by the sound collection time.
The “plurality of speakers” may be two speakers, but preferably three or more.

  In the above-described sound field control system, the analysis unit generates a test sound that is pronounced nth (where n is an integer satisfying n ≧ 1) and mth (where m is m ≧ n + 1) based on the test signal sequence. And the sound collection interval between the nth test sound and the mth test sound obtained from the sound collection result of the sound collection unit. The time difference is calculated.

  According to the configuration of the present invention, by calculating the time difference between the sound generation interval and the sound collection interval, the distance difference from each speaker to the microphone can be calculated, and accurate sound field control is performed based on the distance difference. It can be performed.

  In the above sound field control system, the test signal sequence is a signal sequence for generating a test sound at regular intervals.

  According to the configuration of the present invention, since the sound generation interval is constant, accurate sound field control can be performed with simple arithmetic processing.

  In the above-described sound field control system, the analysis unit is based on a time point that is a predetermined time later than the sound collection timing of the test sound generated nth (where n is an integer satisfying n ≧ 1) based on the test signal sequence. And calculating the time difference between the time length from the start point of each divided section to the sound collection timing of each test sound when the divided sections are set at regular intervals, and a predetermined time.

  In the present invention, a time difference is calculated in each divided section with reference to a time point that is a predetermined time after the sound collection timing of the nth test sound. Thereby, it is possible to perform arithmetic processing without any trouble even in a small work area. In addition, since the time difference is calculated based on the speaker (channel) corresponding to the nth test sound, it is easy to calculate the delay amount for other speakers.

  In the above sound field control system, the sound generation unit is characterized in that the test sound is generated at a sound generation interval corresponding to the characteristics of the speaker that generates sound.

  According to the configuration of the present invention, in the case of a speaker that produces a sound with a lot of reverberation, it is possible to accurately detect the sound collection timing of the next test sound by widening the interval until the sound generation timing of the next test sound. Can do. Thereby, more accurate sound field control can be realized.

  The sound field control system includes an analysis device having a sound collection unit and an analysis unit, and an acoustic device having a sound generation unit and a signal processing unit. The analysis device and the acoustic device are connected via wireless communication. It is characterized by that.

  According to the configuration of the present invention, since the analysis device and the audio device are connected via wireless communication, the troublesome handling of the wired cable can be eliminated.

  In the above sound field control system, the analysis apparatus includes a sound generation command unit that issues a sound generation command to the sound generation unit of the acoustic device, and the sound generation command unit issues a sound generation command for the test signal sequence by one wireless communication. It is characterized by that.

  According to the configuration of the present invention, since the sound generation command for the test signal sequence is issued by one wireless communication, accurate sound field control can be realized even when the communication environment is not stable. In other words, if the sound generation command is issued for each test sound (test signal) and the communication environment is unstable, the time from the sound generation command to sound generation is not constant, so the distance difference from each speaker to the microphone is accurate. However, such a problem can be solved by issuing a sound generation command for all the test sounds by one wireless communication.

  The sound field control system of the present invention causes a speaker to generate a test sound, a sound collection unit that collects the test sound by a microphone, and a test sound to be generated from each speaker sequentially at a predetermined timing. An analysis unit that compares the information indicating the sound generation timing of the test signal sequence with the sound collection timing of each collected test sound and calculates the time difference between the sound generation timing and the sound collection timing of each test sound, Based on the time difference between the sound generation timing and sound collection timing of each test sound, a sound field control information generation unit that generates sound field control information that is a command for matching the distance from each speaker to the microphone, and outputs the sound field control information And a sound field control information output unit.

  The control method of the sound field control system of the present invention includes a sound generation step for causing a plurality of speakers to generate a test sound, a sound collection step for collecting the test sound with a microphone, and a test sound in sequence at a predetermined timing. An analysis step for calculating the time difference between the sound generation timing and the sound collection timing of each test sound by comparing the information indicating the sound generation timing of the test signal sequence generated from each speaker with the sound collection timing of each collected test sound And a sound field control information generating step for generating sound field control information for matching the distance from each speaker to the microphone based on the calculated time difference between the sound generation timing and the sound pickup timing of each test sound, And a sound field control information output step for outputting control information.

According to the configuration of the present invention, accurate sound field control can be performed even when the time from the sound generation command to sound generation is unknown.
Note that “sound field control information” is a command for a speaker, a person, or the like, and indicates information such as the name of a speaker to be controlled and its movement amount or movement direction.
The “sound field control information output unit” refers to means such as display, voice guidance, and communication.

  A program according to the present invention causes a computer to execute a sound collection step and an analysis step in the control method of the sound field control system.

  The program of the present invention causes a computer to execute a sound collection step, an analysis step, a sound field control information generation step, and a sound field control information output step in the control method of the sound field control system.

  A program according to the present invention causes a computer to execute each step in the control method of the analysis apparatus.

  A program according to the present invention causes a computer to execute each step in the above-described method for controlling an audio device.

  The recording medium of the present invention is characterized by recording the above program and being readable by a computer.

  By using the program or recording medium of the present invention, accurate sound field control can be performed even when the time from the sound generation command to sound generation is unknown.

It is a system configuration figure of a sound field control system. It is a control block diagram which shows the hardware constitutions of a sound field control system. It is a functional block diagram which shows the function structure of the smart phone and AV amplifier apparatus which concern on 1st Embodiment. It is a figure which shows an example of the test signal sequence which concerns on 1st Embodiment. It is a figure which shows an example of the recording waveform which recorded the test sound sequence. It is explanatory drawing which shows the time difference of the pronunciation interval of a test sound, and a sound collection interval. It is a flowchart which shows the flow of a process of a smart phone. 10 is a diagram illustrating an example of a test signal sequence according to Modification 1. FIG. It is explanatory drawing which shows the sound-collection timing of the test sound which concerns on the modification 6. FIG. It is a functional block diagram which shows the function structure of the smart phone and AV amplifier apparatus which concern on 2nd Embodiment.

[First Embodiment]
Hereinafter, a sound field control system, an analysis device, a sound device, a sound field control system control method, an analysis device control method, a sound device control method, a program, and a recording medium according to an embodiment of the present invention will be described with reference to the accompanying drawings. Details will be described with reference to FIG. FIG. 1 is a system configuration diagram of a sound field control system SY. The sound field control system SY includes a smartphone 1 (analysis device, external device), an AV amplifier device 2, and a speaker group 3 (3a to 3f). The “acoustic device” in the claims refers to the AV amplifier device 2 and the speaker group 3.

  The smartphone 1 and the AV amplifier device 2 are connected via a wireless communication 5 such as Bluetooth (registered trademark) or a wireless LAN (Local Area Network). The AV amplifier device 2 and the speakers 3a to 3f are connected via a wired communication 4 such as a dedicated cable.

  The speaker group 3 according to the present embodiment corresponds to 5.1 channel, and includes a front left speaker 3a (L), a front center speaker 3b (C), a front right speaker 3c (R), and a surround right speaker 3d (SR). , Surround left speaker 3e (SL) and subwoofer 3f (SW).

  Note that the number of speakers and the types of speakers constituting the speaker group 3 are not limited to the example shown in FIG. In addition, the AV amplifier device 2 and the speakers 3a to 3f may be connected via wireless communication. Furthermore, instead of the smartphone 1, an information processing terminal such as another tablet terminal, a mobile phone, or a notebook PC may be used. In this case, the AV amplifier device 2 may be connected via wired communication in accordance with the communication standard of the information processing terminal.

  Next, the hardware configuration of the sound field control system SY will be described with reference to FIG. The smartphone 1 includes a touch panel 11, a microphone 12, a communication unit 13, a storage unit 14, and a control unit 15. The touch panel 11 functions as an operation unit and a display unit. The microphone 12 picks up sound (inputs an audio signal). The communication unit 13 transmits / receives information to / from the AV amplifier device 2. The storage unit 14 stores various smartphone applications including an OS (Operating System) in a nonvolatile manner. The smartphone application includes a sound field control application for performing sound field control of the AV amplifier device 2. Note that “sound field control” means that test sounds are generated from the speakers 3a to 3f in order to eliminate delays in sound due to variations in distance from the speakers 3a to 3f to the listening position (the position of the smartphone 1). This is measured, and delay processing of audio signals supplied to the speakers 3a to 3f is performed based on the measurement result. The control unit 15 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like, and performs various arithmetic processes such as sound field control.

  On the other hand, the AV amplifier device 2 includes a communication unit 21, a DSP 22 (Digital Signal Processor), an amplifier group 23, and a control unit 24. The communication unit 21 transmits / receives information to / from the smartphone 1. The DSP 22 performs various digital signal processing such as audio signal delay processing. The amplifier group 23 includes a plurality of amplifiers corresponding to each channel (not shown). Each amplifier amplifies the audio signal of each channel and supplies it to the corresponding speakers 3a to 3f. The control unit 24 includes a CPU, a RAM, and the like, and performs various arithmetic processes such as reproduction control. On the other hand, the speaker group 3 produces a sound (outputs an audio signal).

  Next, functional configurations of the smartphone 1 and the AV amplifier device 2 will be described with reference to FIG. The smartphone 1 includes a test signal storage unit 110, a sound generation command unit 120, a sound collection unit 130, a recording unit 140, an analysis unit 150, an adjustment information generation unit 160 (information generation unit), and an adjustment information transmission unit 170 as functional configurations. . The AV amplifier device 2 includes a sound generation unit 210, an adjustment information reception unit 220, and a signal processing unit 230 as functional configurations. In addition, each part 110-170 of the smart phone 1 is mainly implement | achieved by said sound field control application.

  The test signal storage unit 110 of the smartphone 1 stores a test signal sequence used when sound field control is performed. The test signal sequence of the present embodiment is to sequentially generate test sounds from the speakers 3a to 3f at predetermined timings (with predetermined timing settings). The sound generation unit 210 of the AV amplifier device 2 generates the number of test sounds corresponding to the number of connected speakers based on the test signal sequence to the speaker group 3 in a predetermined sound generation interval and in a predetermined order. Let (pronounce step). The sound generation unit 210 includes the DSP 22 and the control unit 24 as main parts.

  FIG. 4 is a diagram illustrating an example of a test signal sequence. As shown in the figure, in this embodiment, the front left (L), the front center (C), the front right (R), the surround right (SR), the surround left (SL), and the subwoofer 3f (SW) are arranged in this order. The test signals are generated from the speakers 3a to 3f. In the present embodiment, the test sound generation interval is set to a fixed time T (equal interval). Further, the sound generator 210 repeats a test sound sequence based on the test signal sequence by a predetermined number of repetitions. As the test sound, it is preferable to use a signal whose signal level changes suddenly, such as an impulse signal.

  On the other hand, the test signal storage unit 110 stores a test signal sequence for each type of AV amplifier device 2 or speaker configuration (number of channels). A sound generation command unit 120, which will be described later, issues a sound generation command using a test signal sequence suitable for the AV amplifier device 2 to be connected (sound generation command step). That is, the model or speaker configuration is determined when the connection with the AV amplifier device 2 is established, and the test signal sequence to be used is determined according to the determination result. The test signal sequence to be used may be determined by selecting a model or speaker configuration by the user.

  The sound generation command unit 120 of the smartphone 1 issues a test signal sound generation command to the AV amplifier device 2. In the present embodiment, a sound generation command is issued for each test signal (test sound) rather than for each test signal (test sound). The sound generation unit 210 of the AV amplifier device 2 causes the speaker group 3 to generate a test sound string in accordance with the sound generation command from the sound generation command unit 120.

  The sound collection unit 130 of the smartphone 1 collects a test sound sequence using the microphone 12 (sound collection step). The sound collection unit 130 includes the storage unit 14 (sound field control application) and the control unit 24 as main parts. The recording unit 140 of the smartphone 1 records the test sound string collected by the sound collection unit 130. FIG. 5 is a diagram illustrating an example of a recording waveform recorded by the recording unit 140. This figure shows a waveform obtained by recording a test sound sequence based on the test signal sequence shown in FIG.

  The analysis unit 150 of the smartphone 1 compares the information indicating the sound generation timing of the test signal sequence instructed by the sound generation command unit 120 with the sound collection timing of each test sound collected by the sound collection unit 130, The time difference between the sound generation timing and the sound collection timing of each test sound is calculated (analysis step). Specifically, the sound generation interval (T) between the test sound sounded nth (where n is an integer satisfying n ≧ 1) and the test sound sounded n + 1 based on the test signal string, The time difference (ΔTn) between the sound collection interval (T + ΔTn) between the nth test sound generated from the sound collection result of the sound unit 130 and the n + 1th test sound is calculated.

  The “information indicating the sound generation timing of the test signal string” is information that defines the sound generation time of the test signal string, and is defined by the sound generation interval of the test signal string in this embodiment. The “sound collection timing” refers to a point in time when the sound pressure (the amplitude of the recording waveform) exceeds a predetermined threshold. In order to accurately detect the sound collection timing, a signal square circuit that squares the sound collection signal, a smoothing circuit to which the output of the signal square circuit is input, and a differentiation processing unit to which the output of the smoothing circuit is input Provided (both not shown), the time when the value differentiated by the differentiation processing unit becomes the maximum value or the minimum value may be detected as the sound collection timing.

  FIG. 6 is an explanatory diagram showing a time difference between the sound generation interval and the sound collection interval of the test sound. This figure shows that the sound collection timing of the test sound (first test sound) generated from the front left speaker 3a (L) is t1, and the test sound (second test sound) generated from the front center speaker 3b (C). ) Is the time t2 and the elapsed time from t1 to t2 corresponds to a time obtained by adding ΔT1 to the test sound generation interval T. Therefore, the sound collection interval between the first test sound and the second test sound in the example of FIG. Here, ΔT1 is a time difference between the sound generation interval and the sound collection interval, and from the distance L1 (linear distance) from the smartphone 1 to the front left speaker 3a (L), from the smartphone 1 to the front center speaker 3b (C). This means that the distance L2 (linear distance) is long (see FIG. 1). That is, for example, when ΔT1 is 2 msec, it can be calculated that the distance L2 is longer than the distance L1 by 2 msec × 1/1000 × 340 m / sec (sound speed) = 0.68 m = 68 cm. In FIG. 1, the distances from the center of the smartphone 1 to the center of the front surface of the speakers 3a and 3b are indicated as L1 and L2. The estimated position of the head of the user when possessing can be used as a reference. Further, instead of the front center of the speakers 3a and 3b, another position of the speakers 3a and 3b may be used as a reference.

  In this embodiment, since the number of speakers is “6”, in addition to ΔT1, the time difference between the sound generation interval and the sound collection interval of the second test sound (for C) and the third test sound (for R) ΔT2, the time difference between the sound generation interval and sound collection interval of the third test sound (for R) and the fourth test sound (for SR) ΔT3, the fourth test sound (for SR) and the fifth test sound (SL) Time difference ΔT4 between the sound production interval and the sound collection interval for the fifth test sound (for SL) and the time difference ΔT5 between the sound production interval and the sound collection interval for the sixth test sound (for SW). A time difference ΔT6 between the sound generation interval and the sound collection interval of the SW (for SW) and the seventh test sound (for L) is calculated. Further, since the test sound string is repeatedly pronounced a plurality of times, ΔT1 to ΔT6 are calculated based on the measurement results for the plurality of times (for example, based on the average value of the measurement results for the plurality of times). Note that the time difference ΔTn may be negative.

  Based on the analysis result of the analysis unit 150, the adjustment information generation unit 160 of the smartphone 1 generates adjustment information used for delay processing of audio signals supplied to the speakers 3a to 3f (information generation step). Specifically, the speaker having the longest distance Ln from the smartphone 1 is identified, and the delay amount of the audio signal is calculated for each of the other five channels with reference to the channel corresponding to the speaker, and the calculation result Is generated as adjustment information. For example, when the speaker 3 having the longest distance Ln from the smartphone 1 among the six speakers 3a to 3f is the front left speaker 3a for the L channel, the C channel is delayed by “ΔT1” and the R channel is “ The delay information is delayed by “ΔT1 + ΔT2”, the SR channel is delayed by “ΔT1 + ΔT2 + ΔT3”, the SL channel is delayed by “ΔT1 + ΔT2 + ΔT3 + ΔT4”, and the adjustment information for delaying the SW channel by “ΔT1 + ΔT2 + ΔT3 + ΔT4 + ΔT5” is generated. The adjustment information transmission unit 170 transmits the adjustment information generated by the adjustment information generation unit 160 to the AV amplifier device 2. Of the six speakers 3a to 3f, the speaker 3 having the longest distance Ln from the smartphone 1 can be identified by calculating using the calculated ΔT1 to ΔT6.

  The adjustment information receiving unit 220 of the AV amplifier device 2 receives the transmitted adjustment information. Further, the signal processing unit 230 performs a delay process on the audio signal supplied to each of the speakers 3a to 3f based on the received adjustment information (signal processing step). For example, as described above, when the speaker 3a (for L) is farthest from the smartphone 1, the delay processing is performed on the channels corresponding to the other speakers 3b, 3c, 3d, 3e, and 3f.

  Next, the flow of processing of the smartphone 1 when performing sound field control will be described with reference to the flowchart of FIG. The smartphone 1 starts recording based on an automatic measurement start operation on the touch panel 11 (S01). After that, a test signal sequence sound generation command (test signal sequence + control signal) is transmitted to the AV amplifier device 2 (S02), and a test signal sequence sound generation start signal is received from the AV amplifier device 2 (S03). The smartphone 1 stops recording after a predetermined time has elapsed since the sound generation start signal was received (S04). Note that, instead of starting recording in S01, recording may be started after a sound generation start signal is received. Alternatively, the automatic measurement start operation of S01 may be performed on the AV amplifier device 2, and the operation signal may be transmitted from the AV amplifier device 2 to the smartphone 1.

  After recording, the smartphone 1 measures the background (background noise) (S05), and determines the test sound detection threshold (S06). Based on this threshold, the sound collection timing of each test sound is detected, and the time difference between the sound generation interval and the sound collection interval is calculated for all speakers (S07). Thereafter, the smartphone 1 generates adjustment information based on the time difference (S08), and transmits the adjustment information to the AV amplifier device 2 (S09). Although not shown in the figure, the AV amplifier device 2 performs audio signal delay processing (delay amount setting for each channel by the DSP 22) based on the adjustment information. A signal indicating the end of processing is transmitted. The smartphone 1 ends the series of processes related to the sound field control by receiving the signal.

  As described above, the sound field control system SY according to the present embodiment compares the information indicating the sound generation timing of the test signal sequence with the sound collection timing of each test sound, and compares the sound generation timing and sound collection of each test sound. Since the timing difference is calculated and the delay processing of the audio signal supplied to the speakers 3a to 3f is performed based on the time difference, accurate sound field control is possible even when the time from the sound generation command to sound generation is unknown It can be performed. In other words, accurate sound field control can be realized by using the simple smartphone 1 without attaching a microphone to the AV amplifier device 2.

  In addition, since the sound generation command from the smartphone 1 to the AV amplifier device 2 is a sound command for the test signal sequence (all test sounds) in one wireless communication, even when the communication environment of the wireless communication 5 is not stable, Accurate sound field control can be realized. That is, when the sound generation command is issued for each test signal and the communication environment is unstable, the time from the sound generation command to sound generation is not constant, and each speaker 3a-3f to the smartphone 1 (microphone 12). Although the distance difference cannot be measured accurately, in this embodiment, since the sound generation command for all test sounds is issued by one wireless communication, there is no such problem.

Note that the following modifications can be employed regardless of the above-described embodiment.
[Modification 1]
In the above-described embodiment, the test sound is generated at regular intervals by the sound generation unit 210. However, the test sound may be generated at a sound generation interval according to the characteristics of the speaker that generates sound. FIG. 8 is a diagram illustrating an example of a test signal sequence according to the first modification. In the example of the figure, the sounding interval (T6) between the subwoofer 3f (SW) and the front left speaker 3a (L) is set wider than the other sounding intervals (T1 to T5). As described above, for the subwoofer 3f (SW) that generates a sound having a lot of reverberations, the sound collection timing of the next test sound is accurately detected by setting a wide interval until the sound generation timing of the next test sound. As a result, more accurate sound field control can be realized.

  As a further modification, the sound generation intervals of T1 to T5 shown in the figure may be different intervals instead of a constant interval. In addition, it is possible to control the sound field by generating a test sound at a timing that matches the time signature (such as triple time or quadruple time) or a predetermined rhythm (such as “the rhythm of the first measure of the XX song”). Can inform the user and does not bore the user. When the “sound generation timing” is defined by time signature or rhythm, it is necessary to define the whole or a part of the time (for example, one bar). That is, it is necessary to add information capable of specifying the test sound generation interval.

[Modification 2]
In the above embodiment, the test signal storage unit 110 is provided in the smartphone 1, but may be provided in the AV amplifier device 2. In this case, the sound generation command unit 120 of the smartphone 1 performs only the sound generation command, and the sound generation unit 210 of the AV amplifier device 2 causes the speaker group 3 to generate a test sound based on a test signal sequence stored in advance. Further, the smartphone 1 acquires a test signal sequence from the AV amplifier device 2 at the time of connection establishment or at the time of sound generation instruction, and the analysis unit 150 collects information indicating the sound generation timing of the acquired test signal sequence and the sound collection unit 130 collects sound. The collected sound timings of each test sound are compared.

  As a further modification, the test signal storage unit 110 may be provided in both the smartphone 1 and the AV amplifier device 2. In this case, the smartphone 1 does not need to acquire a test signal sequence from the AV amplifier device 2, determines the model of the connected AV amplifier device 2 and the number of speakers, and connects the AV amplifier based on the determination result. The test signal sequence for the apparatus 2 may be read from the test signal storage unit 110 and analyzed by the analysis unit 150.

[Modification 3]
In the above embodiment, the adjustment information generation unit 160 is provided in the smartphone 1 (see FIG. 3), but this may be provided in the AV amplifier device 2. In this case, the smartphone 1 may transmit the analysis results (time differences ΔT1 to ΔT6) of the analysis unit 150 to the AV amplifier device 2. As a further modification, instead of generating the adjustment information in the AV amplifier device 2, the delay processing by the signal processing unit 230 may be performed directly from the analysis result of the analysis unit 150.

[Modification 4]
Further, the analysis unit 150 and the adjustment information generation unit 160 may be provided in the AV amplifier device 2. In this case, the smartphone 1 transmits sound collection information indicating the sound collection timing of each test sound by the sound collection unit 130 to the AV amplifier device 2. The AV amplifier apparatus 2 receives the sound collection information (sound collection information reception unit, sound collection information reception step), and the analysis unit 150 obtains the sound collection timing from the information indicating the sound generation timing of the test signal sequence and the sound collection information. The sound collection timing of each test sound is compared, and the time difference between the sound generation timing and sound collection timing of each test sound is calculated. Note that the smartphone 1 may transmit a recording waveform recorded by the recording unit 140 as sound collection information.

[Modification 5]
In the above-described embodiment, the analysis unit 150 generates a sound interval between the nth test sound and the n + 1th test sound, and the nth test sound and the n + 1th test sound. The time difference between the sound and the sound collection interval was calculated by the number of speakers (ΔT1 to ΔT6), but the nth test sound to be pronounced and the mth (where m is an integer that satisfies m> n + 1) The time difference between the sound generation interval of the generated test sound and the sound collection interval of the nth test sound and the mth test sound may be calculated (m ≠ n + 1 may be satisfied). As a further modification, instead of obtaining the sound generation interval and the sound collection interval, information indicating the sound generation timing of the test signal sequence is simply compared with the sound collection timing of each test sound, and based on a predetermined algorithm. The time difference between the sound generation timing and the sound collection timing of each test sound may be calculated.

[Modification 6]
In the above embodiment, the time difference ΔTn is obtained from the sound collection interval (T + ΔTn) between the test sound that is pronounced nth and the test sound that is pronounced n + 1, and the delay amount of each channel is calculated from the time difference ΔTn. 9 (see FIG. 6), as shown in FIG. 9, an arbitrary time is taken with reference to a time point that is a predetermined time after the sound collection timing of the test sound that is first generated (in the example of FIG. 6, the L channel sound collection timing). A delay amount from the reference channel corresponding to the test sound may be calculated. This example is based on the premise that test sounds are generated at regular intervals T. In addition, in the figure, the starting point of each divided section when a divided section is set at a certain interval T with reference to a time point (ta) that is traced back by T / 2 from the sound pickup timing of an arbitrary test sound, It is shown as ta-tf. In this case, the time length Tb from tb to the sound collection timing of the second test sound (for C) can be expressed as “Tb = T / 2 + ΔTb”. Similarly, the time length Tc from tc to the sound collection timing of the third test sound (for R) is “Tc = T / 2 + ΔTc”, and the sound collection timing of the fourth test sound (for SR) from td. The time length Td until “Td = T / 2 + ΔTd”, and the time length Te from the te to the sound collection timing of the fifth test sound (for SL) is “Te = T / 2 + ΔTe”, tf The time length Tf from the first to the sixth test sound (for SW) to the sound collection timing can be expressed as “Tf = T / 2 + ΔTf”. Note that ΔTb to ΔTf may be negative. In this case, the adjustment information generation unit 160 generates adjustment information based on the time difference between the time length from the start point of each divided section to the sound collection timing of each test sound and the predetermined time (T / 2). That is, with respect to the L channel, the C channel is delayed by -ΔTb (advanced by ΔTb), the R channel is delayed by -ΔTc, the SR channel is delayed by -ΔTd, the SL channel is delayed by -ΔTe, and the SW channel Adjustment information for delaying the signal by −ΔTf is generated. However, when the speaker with the longest distance Ln from the smartphone 1 is not the speaker 3a for the L channel, the speaker with the longest distance Ln from the smartphone 1 is specified and the channel corresponding to the speaker is used as a reference. The delay amount is calculated for each of the other five channels, and the calculation result is generated as adjustment information.
In this way, by calculating the delay amount of the other channel from the reference channel corresponding to the arbitrary test sound, based on the time point that is a predetermined time after the sound pickup timing (t1) of the arbitrary test sound, The time difference can be calculated. That is, since it is only necessary to search for the sound collection timings t1 and t2 for each divided section and ta to tb and tb to tc, the time difference can be calculated even in a small work area. In addition, instead of calculating the delay amount between the channels by calculating the time difference ΔTn from the sound collection interval (T + ΔTn) of the test sound, the adjustment information is calculated to calculate the delay amount from the reference channel (L channel in this example). Is easy to generate.
The predetermined time is not necessarily T / 2, but may be a value obtained by multiplying the sound generation interval T by a predetermined value, such as T / 3, T / 4, or a predetermined specified value regardless of the sound generation interval T. There may be. Also, it is not based on the point of time that is traced back for a predetermined time from the sound collection timing of the test sound that is sounded first, but on the point of time that is traced back for a predetermined time from the sound collection timing of the test sound that is pronounced second or later. good.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the adjustment information for performing the delay process of the audio signal is generated. However, in the present embodiment, the sound field control information for adjusting the positions of the speakers 3a to 3f to the user is generated. To do. Only differences from the first embodiment will be described below. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, the modification applied about the component similar to 1st Embodiment is applied similarly about this embodiment.

  FIG. 10 is a functional block diagram illustrating functional configurations of the smartphone 1 and the AV amplifier device 2 according to the second embodiment. Compared with the functional configuration of the first embodiment (see FIG. 3), the smartphone 1 omits the adjustment information generation unit 160 and the adjustment information transmission unit 170, and the sound field control information generation unit 180 (information generation unit) and the sound. A field control information output unit 190 is added. In addition, each part 110-150, 160, 170 of the smart phone 1 is implement | achieved by the sound field control application which is a smart phone application similarly to 1st Embodiment. On the other hand, the AV amplifier device 2 has a configuration in which the adjustment information receiving unit 220 and the signal processing unit 230 are omitted as compared with the functional configuration of the first embodiment.

  The sound field control information generation unit 180 is connected to the smartphone 1 (microphone 12) from each speaker 3a to 3f based on the time difference (time difference ΔT1 to ΔT6) between the sound generation timing and the sound collection timing of each test sound calculated by the analysis unit 150. ) Is generated (sound field control information generation step, information generation step). In the present embodiment, as the sound field control information, a message for causing the user to adjust the positions of the speakers 3a to 3f is generated. For example, information indicating a speaker to be moved, a moving amount, and a moving direction is generated, such as “Please move the front left speaker 50 cm closer to the smartphone side and 30 cm closer to the front center speaker side”. The message to the user may be an abstract message such as “Please bring the front left speaker a little (to the user)”.

  The sound field control information output unit 190 outputs the sound field control information generated by the sound field control information generation unit 180 (sound field control information output step). In the present embodiment, the above message is displayed on the touch panel 11 as an output method. Instead of the display, a message may be output by communication means such as voice guidance or e-mail.

  As described above, according to the second embodiment, since the configuration is such that the user adjusts the speaker position, the audio signal delay processing by the AV amplifier device 2 can be omitted, and the control load of the AV amplifier device 2 can be reduced. In addition, the cost can be reduced.

In the second embodiment, the following modifications can be employed.
[Modification 1]
In the case where the speaker can run on its own, control signals for the speakers 3a to 3f may be output as “sound field control information”. In this case, the sound field control information generation unit 180 generates, as “sound field control information”, a control signal indicating a speaker to be moved, a movement amount, and a movement direction. The sound field control information output unit 190 outputs sound field control information to the speakers 3a to 3f. Each speaker 3a-3f moves based on the acquired sound field control information by a self-propelled means (not shown). According to this configuration, the distances from the speakers 3a to 3f to the smartphone 1 (microphone 12) can be matched without bothering the user.

  As mentioned above, although two embodiment and various modifications were shown, you may provide each component of sound field control system SY (smart phone 1, AV amplifier device 2) shown in these as a program. The program may be provided by being stored in various recording media (CD-ROM, flash memory, etc.). That is, a program for causing a computer to function as each component of the smartphone 1 or the AV amplifier device 2 (including the sound field control application in the embodiment) and a computer-readable recording medium that records the program are also included in the present invention. Is included in the scope of rights. Other modifications can be made as appropriate without departing from the scope of the present invention.

  1: Smartphone 2: AV amplifier device 3: Speaker group 12: Microphone 110: Test signal storage unit 120: Sound generation command unit 130: Sound collection unit 140: Recording unit 150: Analysis unit 160: Adjustment information generation unit 170: Transmission of adjustment information Unit 180: Sound field control information generation unit 190: Sound field control information output unit 210: Sound generation unit 220: Adjustment information reception unit 230: Signal processing unit SY: Sound field control system T: Sound generation interval ΔTn: Time difference

Claims (19)

A sound generator that lets multiple speakers produce test sounds,
A sound collection unit for collecting the test sound by a microphone;
The information indicating the sound generation timing of the test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each collected test sound, and the sound generation timing of each test sound And an analysis unit for calculating a time difference between the sound pickup timing and
A sound field control system comprising: a signal processing unit that performs a delay process of an audio signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound.   Based on the test signal sequence, the analyzing unit is pronounced nth (where n is an integer satisfying n ≧ 1) and mth (where m is an integer satisfying m ≧ n + 1). The time difference between the sound generation interval between the test sound and the sound collection interval between the nth test sound and the mth sound obtained from the sound collection result of the sound collection unit is calculated. The sound field control system according to claim 1.   The sound field control system according to claim 1, wherein the test signal sequence is a signal sequence for generating the test sound at regular intervals.   The analysis unit sets the predetermined interval based on a time point that is a predetermined time later than the sound collection timing of the test sound generated nth (where n is an integer satisfying n ≧ 1) based on the test signal sequence. 4. The sound according to claim 3, wherein a time length from a start point of each divided section to a sound collection timing of each test sound when a divided section is set for each time and a time difference from the predetermined time are calculated. Field control system.   The sound field control system according to claim 1, wherein the sound generation unit causes the test sound to be generated at a sound generation interval corresponding to a characteristic of a speaker that generates sound. An analysis device having the sound collection unit and the analysis unit;
An acoustic device having the sound generation unit and the signal processing unit,
The sound field control system according to claim 1, wherein the analysis device and the acoustic device are connected via wireless communication. The analysis device includes a sound generation command unit that issues a sound generation command to the sound generation unit of the acoustic device,
The sound field control system according to claim 6, wherein the sound generation instruction unit issues a sound generation instruction for the test signal sequence by one wireless communication. A sound generator that lets multiple speakers produce test sounds,
A sound collection unit for collecting the test sound by a microphone;
The information indicating the sound generation timing of the test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each collected test sound, and the sound generation timing of each test sound And an analysis unit for calculating a time difference between the sound pickup timing and
A sound field control information generating unit that generates sound field control information that is a command to match the distance from each speaker to the microphone, based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound;
A sound field control system comprising: a sound field control information output unit that outputs the sound field control information. A sound generation command unit that issues a sound generation command that is a command to sound a test sound to a plurality of speakers,
A sound collection unit for collecting the test sound by a microphone;
The information indicating the sound generation timing of the test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each collected test sound, and the sound generation timing of each test sound And an analysis unit for calculating a time difference between the sound pickup timing and
Based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound, adjustment information used for delay processing of the audio signal supplied to each speaker or a sound field that is a command for matching the distance from each speaker to the microphone And an information generating unit that generates control information. A sound generator that lets multiple speakers produce test sounds,
A sound collection information receiving unit for receiving sound collection information indicating the sound collection timing of each test sound collected by the microphone from an external device including a microphone;
Information indicating the sound generation timing of a test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each test sound obtained from the sound collection information. An analysis unit that calculates the time difference between the sound generation timing and the sound collection timing of
An audio apparatus comprising: a signal processing unit that performs a delay process of an audio signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound. A pronunciation step that causes multiple speakers to produce a test sound;
A sound collection step for collecting the test sound by a microphone;
The information indicating the sound generation timing of the test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each collected test sound, and the sound generation timing of each test sound And an analysis step for calculating a time difference between the sound pickup timing and
And a signal processing step for performing a delay process of the audio signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound pickup timing of each test sound. Method. A pronunciation step that causes multiple speakers to produce a test sound;
A sound collection step for collecting the test sound by a microphone;
The information indicating the sound generation timing of the test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each collected test sound, and the sound generation timing of each test sound And an analysis step for calculating a time difference between the sound pickup timing and
A sound field control information generating step for generating sound field control information, which is a command for matching the distance from each speaker to the microphone, based on the calculated time difference between the sound generation timing and the sound pickup timing of each test sound;
And a sound field control information output step for outputting the sound field control information. A sound generation command step for issuing a sound generation command, which is a command for sounding a test sound to a plurality of speakers,
A sound collection step for collecting the test sound by a microphone;
The information indicating the sound generation timing of the test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each collected test sound, and the sound generation timing of each test sound And an analysis step for calculating a time difference between the sound pickup timing and
Based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound, adjustment information used for delay processing of the audio signal supplied to each speaker or a sound field that is a command for matching the distance from each speaker to the microphone An information generation step of generating control information is executed. A pronunciation step that causes multiple speakers to produce a test sound;
A sound collection information receiving step for receiving sound collection information indicating the sound collection timing of each test sound collected by the microphone from an external device including a microphone;
Information indicating the sound generation timing of a test signal sequence for causing the test sound to be sequentially generated from each speaker at a predetermined timing is compared with the sound collection timing of each test sound obtained from the sound collection information. An analysis step for calculating a time difference between the sound generation timing and the sound collection timing of
And a signal processing step of performing a delay process of the audio signal supplied to each speaker based on the calculated time difference between the sound generation timing and the sound collection timing of each test sound.   The program which makes a computer perform the said sound collection step and the said analysis step in the control method of the sound field control system of Claim 11.   A program for causing a computer to execute the sound collection step, the analysis step, the sound field control information generation step, and the sound field control information output step in the control method of the sound field control system according to claim 12.   A program for causing a computer to execute each step in the method for controlling an analyzing apparatus according to claim 13.   The program which makes a computer perform each step in the control method of the audio equipment of Claim 14.   The computer-readable recording medium which recorded the program of any one of Claims 15 thru | or 18.

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